Agreed that there's plenty of engine power to compensate for the load of the compressor.
As far as cooling effect, I'd say that it does a decent job of cooling the interior in a reasonable amount of time in the summer. It's a pretty big interior space, so it depends what you're comparing to in order to gauge performance. For example, my 2-door extended cab Tacoma cools off very quickly. But it's relative, as the Taco probably has 1/3 the interior space of the 4Runner.
The controls are odd-looking at first, but if you're used to using auto climate control then you'll never touch them. If you're not used to climate control, then you'll be annoyed by the change from an analog temperature knob to an up/down rocker switch that moves one degree at a time. Learn to "set it and forget it", and you'll be satisfied with it in most situations.